Physical Properties of Niobium and Hafnium
Physical Properties
Melting Point
2,468.00 °C
6
2,150.00 °C
10
Boiling Point
2,468.00 °C
99+
5,400.00 °C
5
Appearance
Physical State
Solid
Solid
Color
Gray
Gray
Luster
Metallic
Metallic
Hardness
Mohs Hardness
6.00
6
5.50
7
Brinell Hardness
735.00 MPa
14
1,450.00 MPa
6
Vickers Hardness
870.00 MPa
12
1,520.00 MPa
5
Speed of Sound
3,480.00 m/s
21
3,010.00 m/s
27
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
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